The Walking Dead showrunner Scott Gimple spoke to Collider about the potential of The Walking Dead having a crossover with the upcoming spinoff television series.
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In short, he’s not involved with the spinoff and it doesn’t seem like something that’s likely to happen, but he wouldn’t rule anything out.
I have little to do with the spinoffโฆ This I do know. Its set in the world of The Walking Dead but from what I understand, it’s not like Daryl’s cousin or anythingโฆ I would never say never [to a crossover between the shows] because if I was a viewer I would say that sounds awesome. But we’re doing our own show. I also think a crossover might be tough because it would take a lot of [license] within the comic story. We’ll see. When we get to all-out war, who knows? We’ll add another faction. It’ll be the Saviors and the Hilltop and the ‘Spin-offers’.
So the spinoff series may be a little too removed from the main series to easily tie the two together, but never say never.